Please try enabling the Legacy keyboard input mode. To enable it please follow these steps: 1. In the main Viewer window right-click on the remote Host and choose Properties. 2. Navigate to the tab Remote Screen -> Mode. 3. Enable the checkbox Use legacy keyboard input mode:
Could you please clarify, if there is an endpoint firewall or a gateway firewall?
Also, if it's possible, could you try to connect the Viewer to the Internet via another network interface (e.g. Wi-Fi or mobile network) and see if the issue persists. This will help to isolate the problem.
can I use the very same .EXE file to install to PC-B, and PC-C etc..... or must I set up a new one every time?
Yes, you can configure a "One-Click" installer and then mass-deploy your custom Host on as many computers as you need. The output .exe file is a self-extracting Host installer with your custom settings, so remote users will only need to run the file to install Host on their computers.
There is no need to configure a new "One-Click" package every time. In case each Host needs to have unique settings, simply install the original Host and manually change the Host settings on each remote PC.